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Four measuring ranges portable potentiometer

A potentiometer, portable technology, applied in AC/DC potential difference measurement device, measurement of electrical variables, measurement of current/voltage, etc.

Inactive Publication Date: 2007-09-12
李顺定
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Problems solved by technology

After the two measuring discs are connected, they are connected with the sliding wire disc between the two measuring terminals, so that the brush on the switch of the stepping disc is excluded from the measuring circuit, and there is no switching between the resistances on the three measuring discs, and There will be no deterioration; since the first and second stepping discs have replacement discs, the number of layers of the first and second stepping disc switches is increased, thereby increasing the volume of the instrument and making the switch and instrument structure become complicated

Method used

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  • Four measuring ranges portable potentiometer

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Embodiment Construction

[0007] In the figure, measuring panel II has ten 100Ω end-to-end resistance rings between contacts 1 to 9. When measuring panel II is set to "5", there are five 100Ω resistors between the brush of measuring panel II and node B. It is connected in parallel with five 100Ω resistors, and the maximum resistance after parallel connection is 250Ω, so the 5 contacts are directly connected to the corresponding points on the resistance ring, and the resistance value between the other contacts of the measuring panel II and node B must be 250Ω; when measuring When panel II is set to "4" or "6", four 100Ω resistors and six 100Ω resistors are connected in parallel between the brush of measurement panel II and node B, and the resistance after parallel connection is 240Ω, so contacts 4 and 6 pass through The 10Ω resistor is connected to the corresponding point on the resistance ring; when the measuring panel II is set to "3" or "7", between the brush of the measuring panel II and the node B a...

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Abstract

This invention relates to a four range potential meter with three measuring tray used for constant voltage measuring. The initiative input tray is composed by measuring tray and assistant tray ; the second step input tray has measuring tray composed by ten 100 omega annular resistance net, and assistant tray composed by ten 5 omega resistance; the third tray is double slide wire tray, two measuring tray connect with measuring slide wire by wire, not use switch for switching, remove the impact of variation and thermoelectric force while potential meter measuring, the distinguish ability can reach 0.1 mu V; the invention omits the substitution tray of first and second input trays.

Description

technical field [0001] The invention relates to an instrument for measuring DC voltage. Background technique [0002] At present, for the potentiometer with three measuring discs, in the connection between the three measuring discs, the intermediate disc is generally switched by a switch, which will cause a change in contact resistance and limit the resolution. In order to overcome this problem, large brushes are generally used to increase the contact area, and silver-copper composite materials are used; Patent No. ZL200520101772.0 has announced a new method for solving the variation of switch contact resistance with a potentiometer with three measuring discs. The first and second stepping discs are composed of a measuring disc, a substituting disc and an auxiliary disc. The resistance values ​​on the measuring disc and the substituting disc are the same. Every time a resistance is added to the measuring disc, the substituting disc will reduce the same resistance. , since t...

Claims

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Application Information

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IPC IPC(8): G01R17/20G01R19/00
Inventor 李顺定
Owner 李顺定
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